Specifications include, but are not limited to: Basic Statistics • 180 square miles of service area • 798 employees • 157,813 residential customers (54% inside city limits; 46% outside city limits) • 18,417 commercial customers • 2,374 miles of transmission and distribution lines (1,526 overhead; 848 underground) 2.01.8 Power use: • Average use per household: 12,242 kilowatt-hours per year, 33.5 kilowatt hours per day • Average cost per household: $1,080 per year / $90 per month 2.01.9 Power supply: • Our power supply is 89% hydroelectric power. Of that, 46% is provided by our own hydroelectric power facilities. 2.01.10 Substations: • 4 main/transmission substations • 5 switching stations • 48 distribution substations • 12 dedicated distribution substations • 23 Bonneville Power Administration customer substations • 8 generation switchyards The upgrade will include the four primary software systems listed below as well as other EIM related software applications. • Energy Trading and Risk Management System (ETRM) • CAISO Energy Imbalance Market System (EIM) • Settlements System • EIM Generation and Transmission Outage Management System (OMS)